(a) In mechanically reversible processes, it is first compressed adiabatically to 500kPa, then cooled at a constant pressure of 500kPa to 30C, and finally expanded isothermally to its original state. (b) The cycle traverses exactly the same changes of state, but each step is irreversible with an efficiency of 80% compared with the corresponding mechanically reversible process. Note: The initial step can no longer be adiabatic. Calculate Q,W,U, and H for each step of the process and for the cycle. Take CP= (7/2)R and CV=(5/2)R